Cross-arm.



E. C. VAN DIEST. CROSS ABM. APPLICATION'FILED DEC. I5. 1915.

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WITNESSES.- /0 /Z INVENTOR. j l M 5 CT vanfi/-sf a ATTORNEY.

Patented Sept, 4, 1917.

um earns PAENT onrrca EDMOND C. VAN DIESEL, OF COLORADO SPRINGS, GOLORADO, ASSIGNOR TO TI-IE ASSO- CIATEZD ENGINEERS COMPANY, A CORPORATION OF COLORADO.

CROSS-ARM.

Specification of Letters Patent. Patgntgflfigpt gt, 11915;,

Application filed December 15, 1915. Serial No. 67,008.

To all whom it may concern:

' Be it known that LEDMOND C. VAN Dinsr, a citizen of the United States, residing at Colorado Springs, in the county of El Paso and State of Colorado, have invented certain new and useful Improvements in Cross- Arms, of which the following is a specification.

My invention relates to certain new and useful improvements in cross arms used on poles for the support of conductors in systems of electric current transmission.

The primary object of my invention residesin the provision of a cr0ss-arm made of structural iron, inwhichstrength and durability is combined with simplicity of construction, and which is sufliciently flexible to withstand and mitigate the strains to which a device of this character is ordinarily subject when in use. My improved cross-arm is furthermore adapted to be readily installed on poles of varying diameter without the provision of intricate adjustments, recesses or hearing faces as are required in the application of themajority of cross arms at present in use.

The above and otherobjects all of which will fully appear in the course of the following description, I attain by the mechanism shown in the accompanying drawings, in the various views of which like parts are similarly designated, and in which Figure 1 is a front elevation of my improvedcross-arm in its operative position on a pole,

Fig. 2, a plan view of the parts shown in Fig. 1, and

Fig. 3, a transverse section taken along the line 33, Fig. 1.

Referring more specifically to the drawings, the reference numeral 2 designates a pole of ordinary construction to which the cross arm is attached.

The cross-arm consists of a body portion 3 madeof' a continuous piece of angle metal which is incised and bent to form a pair of convergent side members 4 connected at their upper ends by atransverse member 5 and carrying at their lower extremities, oppositely and laterally projecting branchmembers 6.

The insulators 7 to which, in practice, the conducting wires are attached, are secured upon the branch members-6 and uponthe cross piece connecting the upper end of the convergent members 4.

To form the body portion of the arm as hereinbefore described, one of the sides of the angle-bar is cut or stamped to provide V-shaped incisions 8 and 9 which permit of the other side of the metal being bent at the respective points.

The members 4 are bent with relation to the connecting cross-piece 5 until the oppo site edges of the incisions which establish the bending points, engage each other as shown in Fig. 1, and the branch-members G are bent relative to the convergent side member-s4: until they are positioned in sub stantially horizontal alinement;

The cross-arm is reinforced at the point of juncture of its convergent side members by a plate 10 which overlaps the joints between the said members and the connecting cross-member 5 and which is securely at tached to the members by means of bolts or rivets l2.

A brace 13 made of strap metal is bent to embrace a pole against which the body portion of the arm is disposed as shown in the drawings,

The end portions of the brace are bent to extend in a common plane at an angle to its angularly bent body portion, and the said end portions of the brace are secured by rivets 14L or other suitable fastening means, to the branch members 6 and the convergent side members 4' across the gaps produced at the points at which they are bent with relation to each other.

The cross-arm-is secured to the pole upon which it is mounted, by means of two bolts 15 one of. which is inserted through registering holes in the pole and the reinforcing plate 10, while the other one extends through an opening in the pole and a central opening in the brace 13.

Nuts screwed upon the threaded ends of the bolts secure the parts against displacement.

A cross-arm constructed and mounted as hereinbefore described, will effectively withstand the stress to which it is subject, not only on account of the strength of its construction and the flexibility of its projecting parts, but also by reason of the manner in which it is placed on the pole with the con nected portions of its convergent arms, and

the central portion of the brace engaging opposite sides thereof.

It will be readily understood that by either bending the brace'to different angles, or by providing a substitute brace of different depth, the cross-arm may be applied to posts of varying diameter.

It is desirable for the purposes of the present invention that. the branch members 6 and the cross-member 5 to which the insulators are applied, are connected at the corners of a substantially equilateral triangle.

As is known to those versed in the art to which my invention appertains, the distances between the insulators on a cross-arm of this character, must necessarily be varied in accordance with the potential transmitted by the conductors attached thereto, and the cross-arm as hereinbefore described is particularly adapted to be bent to different angles for changing the distance between the branch-members in accordance with the current voltage it is desired to transmit.

In case of higher voltage the members 4 and 6 arelengthened and bent at different angles whereby to increase the distance between the insulators and in case of lower voltage the members are shortened proportionately, while maintaining the ratio between the parts of the cross arm so that in each case the insulators are disposed adjacent the corners of a substantially equilateral triangle.

Having thus described my invention what I claim and desire to secure by Letters-Patent is:

l. A cross-arm comprising a body element composed of a continuous piece of anglemetal incised at one of its flanges and bent at its points of incision to provide a pair of convergent side-members connected at one of their ends and branch members projecting oppositely at the other ends of the side members, and a brace element secured transversely of the body-element and adapted to embrace a pole against which said body-element is disposed.

2. A cross-arm comprising a body element composed of a continuous piece of anglemetal incised at one of its flanges and bent at its points of incision to provide a pair of convergent side-members connected at one of their ends and branch-members projecting oppositely at the other ends of the of their ends, and branch-member's projecting oppositely at the other ends of the side members, and a brace-element secured across the joints between the side-members and the branch members of the body-element and adapted to embrace a pole against which said body-element is disposed.

4. A cross-arm comprising a body-element composed of a continuous piece of anglemetal incised at one of its flanges and bent at its points of incision to provide a pair of convergent side-members, a cross-member connecting the side-members at one of their ends, and branch-members projecting oppositely at the other ends of the side-members, and a brace-element secured across the joints between the side-members and the branch membersof the body element and adapted to embrace a pole against which said bodyelement is disposed. 1 V

5. A cross-arm comprising a body-element-composed of a continuous piece of angle-metal incised at one of its flanges and bent at its points of incision to provide a pair of convergent side-members, a crossmember connecting the. side-members at one of their ends, and branch-members projecting oppositely at the other ends of the sidemembers, aplate secured across the joints between the crossanember and the side members of the body element, and a brace-element secured across the joints between the side-members and the branch-membersof the same and adapted to embrace a pole against which said body-element is disposed.

6. A cross-arm comprising a body-element composed of a continuous piece of anglemetal bent at opposite sides of and, adjacent to its center to provide two divergent sidemembers and a connecting cross-member, and bent adjacent its free ends to provide oppositely projecting branch-members adapted for the support of insulators, and a braceelement secured transversely of the bodyelement to said branch-members and adapted to embrace a pole against which said body-element is placed. j

7 A cross-arm comprising a body-element composed of a continuous piece of anglemetal bent at opposite sides of and adjacent to its center. to-provide, two divergent side-members and a connecting cross-mem ber adaptedfor the support of an insulator, said side-members being bent adjacent its free ends to provide oppositely projecting branch-members adapted for the support of insulators, and a brace-element secured adjacent said free ends ofthe side-members transversely of the body-element and adapted. to embrace a pole against which said body-element is placed.

8. A cross-arm comprising a body-element composedof a continuous piece of anglemetal bent at opposite sides of and adjacent to its center toprovide two divergent sidemembers and a connecting cross-member, and bent adjacent its freerends to provide oppositely projecting branch-members, a plate connecting the side-members adjacent their other ends, and a brace-element secured transversely of the body-element and adapted to embrace a pole against which said body-element is placed.

9. A cross-arm comprising a trilateral skeleton structure having two straight sides of equal lengths joined at the apex of the frame by atransverse connection adapted for the support of an insulator and having at their opposite ends adjoining the straight basal side of the frame, laterally and outwardly projecting branches adapted for the support of insulators, and a plate secured to said equal sides adjacent said transverse In testimony whereof I have aiiiXed my signature in presence of two Witnesses.

EDMOND C. VAN DIEST.

Witnesses ELIZABETH V. I-Irrn,

WALTER M. l/VILsoN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. G. 

